I have a Google Pixel 5 phone, am running Android 13, and use Verizon as my carrier. I'm trying to use the internet less so I usually keep my internet off, including turning off my data and wifi connections.
I've noticed that when my internet is turned off I can't send texts to some people until I turn my internet back on. The send text message button on my phone is grayed out when trying to text some people until I turn the internet back on. I can send text messages to some people with the internet turned off, including to some iPhone users.
Is this issue most likely caused by trying to send texts to a person's iPhone and they have iMessage turned on?
I'm aware that if an iPhone user turns on iMessage then they must keep their internet connection on or they can't send texts from their phone.